Presentation 2015-05-21
Study on a nanosize light-probe with a dielectric slot-waveguide
Makoto Tsubokawa, Deqing Kong,
PDF Download Page PDF download Page Link
Abstract(in Japanese) (See Japanese page)
Abstract(in English) A new design for a nanosize light-probe with a slot-waveguide structure has been evaluated by a finite-difference time-domain simulation. The model, with a 50-nm slot core, enables illumination around the tip of the probe using a small optical spot 50–250 nm wide with 20%–30% transmission efficiency. Based on the high-index-contrast structure in a slot waveguide, a nanosize optical spot is easily generated, which is impossible with a normal slab waveguide. Similar properties of optical spot and transmission efficiency are obtained for different geometric configurations of flat-faced and tapered dielectric slot waveguides in illumination mode. The transmission efficiency of our models is the same or higher than that in conventional metallic tapered optical probes. When operating in illumination and collection modes, a near-field light reflected at 50–200-nm-wide measured objects is clearly observed, and a spatial resolution of ~50 nm is obtained. These findings suggest the potential for slot-waveguide structures to expand the versatility of nanosize optical probes.
Keyword(in Japanese) (See Japanese page)
Keyword(in English) Optical slab waveguide / Optical probe / Near-field light / High-index contrast structure
Paper # OFT2015-3
Date of Issue 2015-05-14 (OFT)

Conference Information
Committee OFT
Conference Date 2015/5/21(2days)
Place (in Japanese) (See Japanese page)
Place (in English)
Topics (in Japanese) (See Japanese page)
Topics (in English)
Chair Hiroshi Naruse(Mie Univ.)
Vice Chair
Secretary (Sumitomo Electric Industries)
Assistant Masaki Ohmura(Sumitomo Electric Industries) / Hidenobu Hirota(NTT)

Paper Information
Registration To Technical Committee on Optical Fiber Technology
Language JPN
Title (in Japanese) (See Japanese page)
Sub Title (in Japanese) (See Japanese page)
Title (in English) Study on a nanosize light-probe with a dielectric slot-waveguide
Sub Title (in English)
Keyword(1) Optical slab waveguide
Keyword(2) Optical probe
Keyword(3) Near-field light
Keyword(4) High-index contrast structure
1st Author's Name Makoto Tsubokawa
1st Author's Affiliation Waseda University(Waseda Univ.)
2nd Author's Name Deqing Kong
2nd Author's Affiliation Waseda University(Waseda Univ.)
Date 2015-05-21
Paper # OFT2015-3
Volume (vol) vol.115
Number (no) OFT-44
Page pp.pp.11-16(OFT),
#Pages 6
Date of Issue 2015-05-14 (OFT)